New OS Type A10 Networks ACOS Loadbalancers

Hi all,

I like the software! Was only missing support for the A10 Networks ACOS device type. So I added it.
In the attached rar you find the files I added or modyfied. I usually don't develop so I hope you can find your way out my files. Files I changed I added completely in the rar, I don't know what is the easiest to deliver the changes otherwise.

Hopefully you can add the device to the project.

Thanks!